Ensure your bike stays where you left it with the Forum D Lock from market leaders Masterlock. With a high security cylinder featuring additional pick resistance & a 13mm hardened steel, dual locking shackle that can withstand over two tons of pull force, the Masterlock Fortum D is a hard nut to crack. An additional 120cm cable lock lets you secure your key accessories & removable parts to the lock so you dont come back to your bike to find it missing a wheel or saddle. Lifetime guarantee No matter what happens, if your Masterlock fails in any way due to manufacturing defects, Masterlock will replace your lock. With luck this Masterlock could last a lifetime!